Lifting-jack.



PATBNTED JUNE 5, 1906.

E. 0001;. LIFTING JACK.

APPLICATION FILED JULY 26 1905 2 SHEETSSHBET 14 Witgesses: Z W X. 77;

No. 822,350. PATENTED JUNE 5, 1906.

B. COOK.

LIFTING JACK.

APPLICATION FILED JULY 26, 1905.

2 SHEETSSHEET 2.

Witgcsses:

A W C MIA 7 v a TED STATES PATENT 1 EUGENE COOK, OF KALAMAZOO, MICHIGAN, ASSIGNOR TO UOOKS RAILWAY APPLIANCE (30., OF KALAMAZOO, MICHIGAN.

LlFTlNG-JACK.

Specification of Letters Patent.

Patented June 5, 1906.

Applioation filed July 26,1905. Seria1No.271,372.

To aZZ whom it may concern.-

Be it known that I, EUGENE 000K, a citizen of the United States, residing atthe city of Kalamazoo, county of Kalamazoo, State of Michigan, have invented certain new and useful Improvements in Lifting-Jacks, of which the fol owing is a specification.

i This invention relates to improvements in lifting-jacks.

The main object of this invention is to provide an improved lifting-jack which may be tripped with com arative case even while under a heavy loa Further objects and objects relatin to structural details will definitely appear i rom the detailed description to follow.

I accomplish the objects of my invention by the'devices and means described in the following specification.

The invention is clearly defined and pointed out in the claims.

A structure embod 'ng the features of my invention is clearly il ustrated in the accompanying drawings, forming a part of this specification, in which- Figure l is a side elevation view, partially in section, to show the arrangement of the parts of a structure embodying the features of my invention. Fig. 2 is a side elevation view of a modified structure, only the lever and pawls with the trips therefor being shown. Fig. 3 is a sectional view taken on a line corresponding to line 3 3 of Fig. 2 looking in the drection of the little arrows at the ends of the section-lines. Fig. 4 is a side elevation view of the structure appearing in Fi 2 in a reverse position. Fig. 5 is' a detail si e elevation view, partially in section, to show the arrangement of the parts of the structure appearing in Fig. 1 adapted to a singleactmg lifting-jack.

n the drawings similar letters of reference refer to similar parts throughout the several views.

Referring to the drawings, A is the frame, I

' downwar it the pawls thus arranged ever and is of sufficient length to engage the bar above the pawl D, allowing space for the free movement thereof. In this structure the lifting-bar is acted upon only on the D engaging the bar to hold it during the upper movement of the lever as stated.

The structure shown in Fig. 5 is a structural modification of the structure shown and described in Letters Patent No. 787,435, issued to me on the 18th day of April, 1905, and this invention is an adaptation of my invention therein shown.

In use it is frequently necessary to disengage the pawls to release the lifting-bar or to trip the complish by the trip-hooks e. In the preferred construction the trip-hooks e are arranged to engage the laterally-projecting pins 0 and 'd and the pawls I) D respectivel The hooks e are pivoted on the levershan C at CC, These pawls preferably have a common or single shank E, as is illustrated in Figs' 1 and 5, although they may have separate shanks, as E E. (See Fi s. 2, 3, and 4'.) It is evident, however, t at the trips shown in Figs. 1 and 5 are more simple to manufacture and to'operate. The tr1 hooks are so arranged as to act upon t e outer pawl first, releasin it from the liftingbar before the inner aw is actedupon. t will be readily seen t at as the lever 1s forced downwardly with the hooks intheirengaging1 position the load will largely be remove om the outer awl, so that only a comparative'amount o ower is required to withdraw/it from the ar. The pull on the inner awl is comparatively direct, so that it may be withdrawn from the bar with comparative case. When the load is being lifted, the hooks are preferably thrown back a ainst the rest 0, as I have indicated by otted lines in Fig. 1-.

simple toconstruct an very durable in use.

movement of-the lever, the pawl ack,.as it is called. This I ac- I have illustrated and described the same in detail in the form preferred by me on account tion in structural details without departing from my invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a lifting-jack, the combination of a frame; a lifting-bar; an operating-lever iv-' oted to said frame; a pair of awlspivote on said lever at opposite sides 0 its ivot-point laterally-pro'ectin pins on said pawls; a pair of trip-hooks having a common shank,

ivoted on said lever, adapted to enga e said aterally-projecting pins on said paws, arranged so as --to withdraw the outer pawl from engagement with the lifting-bar before the inner pawl is acted upon, for the purpose specified."

2. In a lifting-jack, the combination of a frame; a lifting-bar; an operating-lever ivoted to said frame; a pair of pawls pivote on said lever at o posite sides of its plvotoint a pair of tripooks having a commons ank,

ivoted on said lever, arranged so as to withdraw the outer pawl from engagement with the lifting-bar before the inner pawl is acted upon, for the purpose specified.

3. In a lifting-jack, the combination of a frame; a lifting-bar; an operating-lever ivoted to said frame; a pair of pawls pivote on said lever at opposite sides of its pivot-point laterally-projecting pins on said pawls; a pair of trip-hooks pivoted on said lever, adapted to engage said laterally-projecting pins on said paw s, arranged so as to withaaaaeo draw the outer pawl from engagement with the lifting-bar before the inner pawl is acted upon, for the purpose specified.

- t. In a lift ng-jack, the combination of a frame; a lifting-bar; an operating-lever pivoted to said frame; a pair of pawls pivoted on said lever at opposite sides of its pivot-point a of trip-hooks, pivoted on said lever, ar-

ranged so as to withdraw the outer pawl from engagement with the lifting-bar before the inner pawl-is acted upon, for the purpose specified. Y

5. In a lifting-jack, the combination of a frame; a lifting-bar; an operating-lever ivoted to said frame; a pair of pawls ivote on said lever at opposite sides of its pivot-point trips ivoted on said lever, arranged to engage t e said pawls successively to Withdraw the outer pawl from engagement with the lifting-bar before the inner pawl is acted upon, for the purpose specified.

6. In a lifting-jack, the combination of a .frame; a lifting-bar; an operating-lever pivnesses.

EUGENE COOK. Witnesses OTIS A. EARL, ETHEL A. BRADFORD. 

